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By Ken Haapala, President, Science and Environmental Policy Project
Data Quality – Surface Temperatures: Writing in Energy Matters, Roger Andrews has begun an examination of efforts to adjust measurements to a preconceived idea. His first part deals with land-based, surface-air temperatures (SAT). Ideally, these are taken roughly at 5 feet +/- one foot (1.5 to 2 meters) above the ground, in the shade, over a grassy or dirt field, 100 feet from pavement, buildings, trees, etc. A Stevenson screen is the standard to provide shade and protection from precipitation. As research by Anthony Watts has shown, relatively few official measuring devises in the US meet these criteria, which have not been moved.